package com.xry.common.util;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

public class ExpiryMap {
    //用来存储数据的容器
    private Map<String,Object>map=new HashMap<String,Object>();
    //存储数据的有效期
    private Map<String,Long> expiryMap=new HashMap<String,Long>();
    //检查过期线程（池）
    private ScheduledExecutorService service= Executors.newSingleThreadScheduledExecutor();
    //检查周期
    private long expiryTime=1000*6;
    public ExpiryMap(){
        service.scheduleAtFixedRate(this::clearExpiry,expiryTime,expiryTime, TimeUnit.MILLISECONDS);
    }

    public ExpiryMap(long expiryTime){
        this.expiryTime=expiryTime;
        service.scheduleAtFixedRate(this::clearExpiry,expiryTime,expiryTime, TimeUnit.MILLISECONDS);

    }
    public void put(String key,Object value){
        map.put(key,value);
        expiryMap.put(key,System.currentTimeMillis()+expiryTime);
    }
    public void put(String key,Object value,long expiryTime){
        map.put(key,value);
        expiryMap.put(key,System.currentTimeMillis()+expiryTime);
    }
    public Object get(String key){
        System.out.println(map);
        if (expiryMap.get(key)!=null && expiryMap.get(key)<System.currentTimeMillis()) {
            map.remove(key);
            expiryMap.remove(key);
        }
        return map.get(key);
    }

    public void remove(String key){
        map.remove(key);
        expiryMap.remove(key);
    }
    public boolean containsKey(String key){
        if (expiryMap.get(key)!=null &&expiryMap.get(key)<System.currentTimeMillis()){
            map.remove(key);
            expiryMap.remove(key);
        }
        return map.containsKey(key);
    }
    //清除掉过期的Key
    public void clearExpiry(){
        for(String key:expiryMap.keySet()){
            if(expiryMap.get(key)<System.currentTimeMillis()){
                map.remove(key);
                expiryMap.remove(key);
            }
        }
    }


}
